Device for folding paper bags



June 26, 1923. 1,459,825

' P. GANGLER DEVICE FOR FOLDING PAPER BAGS Filed May 15, 1922 RaulGanyh' Attorney.

Patented June 26, 11923),

iataezt PAUL GANGLER, OF ESSLINGEN, GERMANY.

DEVICE FOR FOLDING PAPER BAGS.

Application filed M33 15, 1922. Serial No. 561,038.

To all whom it may concern Be it known that I, PAUL (innennm-engineer, acitizen of the Republic of Wurttemberg, resldlng at 53 Panoramastrasse,Esslingen, Germany, have invented certainnew. and useful Improvements ina Device for- Folding Paper Bags, of whleh the following is aspecification.

y invention relates to a new or improved 0 device for folding orflattening open bags of paper or similar material, preferably of angularcross-section, and consists essentially in the construction, arrangementand manner of operation of the device as will be described in thefollowing specification with reference to the accompanying drawing,

showing one construction of the machine by way of example.

In the drawing:

Fig. 1 is a side-elevation of the device and shows in particular thosefolding elements which effect the flattening out of the bags, theseparts being shown in full lines in their starting position and in brokenlines in their final position.

Fig. 2 is a plan view of the maehineand shows in particular thosefolding elements,

which force the sides of the bags inwards,

and crease them, the initial positions of lines and the final positionsin broken lines. Fig. 3 shows in full lines a cross-section through thebag to be folded up prior to the folding. and in broken lines across-section of the bag after the folding up, and

Fig. 4 is a side elevation of the folded bag. In the illustratedconstruction, two substantially parallel to each other movable foldingpairs 1, 2 and 30, 31 are used, of which the pair 1, 2 consists ofplates of the width of the bag A, and the pair 30, 31 of folding knives.These pairs of folding elements perform an inwardly and rearwardlydirected swinging movement, the folding knives 30, 31 entering betweenthe folding plates 1, 2.

In order to effect thismovement, the

plates 1 and 2 may be hinged by means of lugs 3, 3 and 4, 4respectively, upon levers 12, 13 and 17, 18 which are keyed upon shafts50, 51 and 52, 53 rotatable in a suitable and which is therefore notshown these elements being again shown in full known manner instationary bearings not shown. The shafts 50, 51 and 52, 53 are coupledtogether by connecting links 16 and 21 joining their fixed arms 14, 15and 19, 20. The oscillating movement of the shafts 50, 51 and 52, 53 maybe effected by any suitable common drive, which is therefore not shownin the drawing. 7 I

The parallel inward and rearward movement of the folding knives 30 and31 may be effected in a similar manner to the plates 1 and 2, forinstance by the shafts 54, and 56, 57 rotatable in stationary bearingsand fitted with the bell-cranks 32, 34; 33, 35; 37, 39; and 45, 40,which are connected by the links 36 and 58. The shafts54 to 57 may berotated by any suitable common drive, in the drawing.

At the front or inlet end of the plates 1 and 2, there are arrangedangular plates 22 or 23, fulcrumed by means of hinges 59 and 65 uponpins 25 and 26, disposed at the frontends of the plates 1 and 2. Theseplates 22 and 23 are adapted to be swung inwards in any suitableknownmanner, which is therefore not shown, so that they engage correspondingrecesses 66 and 67 at the inside of the plates 1 and 2. The plates 1 and2 are at their opposite or rear ends furnished with pressing plates 61and 63.

The realenclosure of the folding bag is in the upper half formed by afixed plate 24 serving as abutment for the bottom of the bag. and inthelower half by a drum 29,

which is intermittentlv rotated in the direc tion of the arrow by theshaft 28 to perform one complete revolution. this, are well known andtherefore not illustrated. The drum 29 consists of single ring ordisc-like portions 29, and the pressing plate 61 of the folding plate2consists of fingers or prongs which conform in shape Means to effectthe inside of the abutment 24. A contact or counter drum 2? rotated bythe shaft 71 cooperates with the drum 29.

The device operates in the following manner:

The bag A to be folded is pushed or otherwise inserted between thefolding pairs 1, 2 and 30, 31, until the bottom of the bag rests againstthe abutments 24,164, the holders 22 and 23 being then turned inside andgrip ping the open or front edges of the bag in conjunction with therecesses 66 and 67 The plates 1 and 2 and the folding knives 30 and 31are then swung inwards and rearwards, as indicated in Figs, 1 and 2,whereby the folding knives 30 and 31 enter between the folding plates 1and 2, until the plates 1 and 2 and folding ,knives 30 and 31 take upthe positions shown in broken lines in Figs. 1 and 2. In this positionof the folding elements, the sides of the bag have been creased and thebag flattened as shown in broken lines in Fig. 3, by the cooperation ofthe plates 1 and 2 and folding knives 30 and 31, while the bottom of thefolded bag is pressed against the abutment 64 and 2 1 by the pressingplates 61 and 63.

Now the drum 29 performs a complete revolution, during which thefollowing or rear edge of the recess 60 in the drum engages the lowerhalf of the flattenedout bottom of the bag A and carries the bag along,so that the front edge of the bag bottom passes between the drum 29 andthe contacting drum 2'? and the folded or collapsed bag is withdrawnfrom the device after the holders 22 and 23 have released the frontedges of the bag. During this withdrawal of the bag A, a useful furthercompression or flattening of the bag, especially of its bottom part,takes place between the drums 27 and 29. The form of the flattened bagcoming from the device, is shown by the side elevation illustrated inFig. 4:.

The device or apparatus described and illustrated serves, as alreadymentioned, to clearly explain the invention. It is therefore obviousthat the device shown may be varied and its details modified within theambit of the claims without departing from the spirit of the invention.It will thus also be understood that the invention is not limited 'tothe construction illustrated.

I claim:

1. In a device for folding angular paper bags, the combination of a topand bottom plate, means for moving said plates substantially paralleltowards each other and rearwards, a pair of knives, and means for movingsaid knives substantially parallel towards each other and rearwards atright angles to said plates. V

2. In a device for folding angular paper bags, the combination of a topand bottom plate, a pair of bell cranks hinged to each of said platesand adapted to move them towards each other and rearwards, a pair ofknives and a pair of hell cranks hinged to each of said knives andadapted to move said hinged to said lugs with one arm, a connecting linkjoining the two other arms of said bell cranks, shafts upon which saidbell cranks are keyed, bearings for said shafts, means for rocking saidshafts in opposite direction, a pair of knives disposed at the sideofsaid plates, a pair of lugs upon the outside of said knives, a pair ofbell cranks hinged to said lugs with one arm, a connectinglink joiningthe two other arms of said bell cranks, shafts upon which said bellcranks are keyed, bearings for said shafts, and means for rocking saidshafts in opposite directions so that said knives move towards eachother at right angles to and be tween said plates.

4. In a device for folding angular paper bags, the combination of a topand bottom plate, an angular gripper fulcrumed at the front edge of eachof said plates and adapted to engage a recess at its inner face, a pairof lugs upon the outer face of each of said plates, apair of lugs uponthe outside of said knives, a pair of hell cranks hinged to said lugswith one arm, a connecting link joining the two other arms of said bellvcranks, shafts upon which said bell cranks are keyed, bearings for saidshafts, and

means for rocking said shafts in opposite directions so that said knivesmove towards each other at right angles to and between said plates.

5. In a device for folding angular paper bags, the combination of a topand bottom plate, an angular gripper fulcrumed' at the front edge ofeach of said plates and adapted to engage a recess at its inner face,outwardly extending pressing plates at the rear edge of each of saidplates, a pair of lugs upon the outer face of each of said plates, apair of bell cranks hinged to said lugs with one arm, a connecting linkoining the two other arms of said bell cranks, shafts upon whichs'aidbell cranks are keyed, bearings for said shafts, means for rockingsaid shafts in 'opposite directions, a pair of knives disposed at theside of said plates. a pairof lugs upon the outside of said knives, apair of bell cranks hinged to said lugs with one arm, a connecting linkjoining the two other arms of said bell cranks, shafts upon which saidbell cranks are keyed, bearings for said shafts, and means for rockingsaid shafts in opposite directions so that said knives move towards eachother at right angles to and a contacting roller cooperating with saidbetween said plates, and a fixed abutment rings to deliver the foldedbags. 10 for the upper and a movable abutment for a In testimony whereofI aflix my signature the lower of said pressing plates upon saidinpresenoe of tWo Witnesses.

5 top and bottom plates, said lower abutment PAUL GANGLER. [L. s.]

consisting of a plurality of recessed rotary" Witnesses: rings betweenwhich the recessed rear edge BERToLD A. BRAUN. [11. s.] of the bottomplate is adapted to enter and OTTO WAG ER. [L.&]

